After the victory on the field of Pelennor, Éomer took counsel with the Captains of the Host of the West, and it was decided that an attempt must be made to draw Sauron’s eye away from his own lands, and to allow the Ringbearer time to complete his mission. Éomer led nearly three thousand of the Rohirrim to battle, leaving Elfhelm another three thousand to help defend Minas Tirith, as well as an eored that returned to Rohan’s eastern borders to guard against a possible assault from the north. Upon reaching the land of Mordor, Éomer and his men helped to win Frodo time, and the Black Gates were thrown down, yet much more of that day is told elsewhere. The victorious army of the West returned to Minas Tirith for the crowning of Aragorn as King Elessar Telcontar; Éowyn agreed to marry Faramir, son of Denethor, and later Aragorn renewed the Gift of Cirion, and Éomer took again the Oath of Eorl. Weeks later, Éomer returned to Gondor with many of the Rohirrim, and they, along with Aragorn and many fair folk, rode to Meduseld, where they laid Théoden to rest in a great mound outside Edoras.
In the years that followed the War of the Ring, Éomer Éadig ruled the Rohirrim with dignity, and the kingdom prospered once again. In the coming years, whenever King Elessar went with war to subdue the last remnants of his enemies, so too went his friend King Éomer;
Important Places and the Borders of Rohan:
The capital of Rohan was the hill fort of Edoras which lay on the slopes of the White Mountains. Another major city was Aldburg, capital city of the Eastfold and original city of Eorl the Young. Other cities may have existed but are not named.
A known camp was Dunharrow, even deeper in the White Mountains. Additionally, one of the most significant places in Rohan was the Hornburg, a great fortress which at the center of a chain of fortifications at Helm’s Deep.
The borders of Rohan were: the river Isen (in the west, bordering Saruman’s Isengard); the river Adorn (a tributary of Isen, also in the west, forming the border with the unfriendly Dunlendings); the White Mountains (in the south); the Mering Stream (in the southeast, the border between Rohan and Gondor); the Mouths of Entwash (in the east); and the Limlight (a tributary of the Anduin, the northern border).
At the time of the War of the Ring, Rohan was roughly a third the size of Gondor, whose borders had slowly been shrinking for decades.
Climate and Countryside:
The countryside of Rohan is described as a land of pastures and lush tall grassland. It looks a lot like the Central Asian steppe or North American Great Plains, as does its climate. The lands of Rohan are frequently described as appearing like “seas of grass”.
Rohirric:
Rohirric is, like the languages of all Men, akin to Adûnaic, the language of the Edain. The Rohirrim call their homeland the Ridenna-mearc, the Riddermark or Éo-marc, the Horse-mark, also simply the Mark and call themselves the Eorlingas, the Sons of Eorl. In the original Rohirric the name for their land is Lôgrad, with the element “lô-“/”loh-” corresponding to Anglo-Saxon “éo”, horse.